使用Servlet上传多张图片——Dao层（BaseDao.java）

package orz.treeSquirrels.dao;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;/** * *    * 项目名称：test_uploadFile   * 类名称：BaseDao   * 类描述：   数据库公用类* 创建人：Mu Xiongxiong  * 创建时间：2017-10-11 下午7:05:17   * 修改人：Mu Xiongxiong   * 修改时间：2017-10-11 下午7:05:17   * 修改备注：   * @version    * */public class BaseDao {Connection  conn=null;PreparedStatement ps=null;ResultSet rs=null;/** * * @Title: getConnection* @Description: 创建连接* @param @return* @param @throws ClassNotFoundException* @param @throws SQLException    设定文件* @return Connection    返回类型* @throws */public  Connection getConnection() throws ClassNotFoundException, SQLException{Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");if(conn==null){conn=DriverManager.getConnection("jdbc:sqlserver://127.0.0.1:1433;databasename=uoloadFileDB;User=sa;Password=171268");}return conn;}/** * * @Title: executeUpdate* @Description:增删改通用方法* @param @param sql* @param @param prams* @param @return* @param @throws ClassNotFoundException* @param @throws SQLException    设定文件* @return int    返回类型* @throws */public int executeUpdate(String sql, List<Object> prams)throws ClassNotFoundException, SQLException {int rel = -1;conn = getConnection();/*if(conn.isClosed()){conn=null;conn = getConnection();}*/ps = conn.prepareStatement(sql);if (prams != null) {for (int i = 0; i < prams.size(); i++) {ps.setObject(i + 1, prams.get(i));}}rel = ps.executeUpdate();return rel;}/** * * @Title: executeQurey* @Description: 查询的操作* @param @param sql* @param @param prams* @param @return* @param @throws ClassNotFoundException* @param @throws SQLException    设定文件* @return ResultSet    返回类型* @throws */public ResultSet executeQurey(String sql,List<Object> prams) throws ClassNotFoundException, SQLException{conn=getConnection();ps=conn.prepareStatement(sql);if(prams!=null){for (int i = 0; i < prams.size(); i++) {ps.setObject(i+1, prams.get(i));}}rs=ps.executeQuery();return rs;}/** * * @Title: closeAll* @Description: 关闭资源* @param     设定文件* @return void    返回类型* @throws */public void closeAll(){if(rs!=null){try {rs.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(ps!=null){try {ps.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(conn!=null){try {conn.close();conn=null;} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}